{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["member collection", "message topic"], "input": "the more common double horn has a fourth valve , usually operated by the thumb , which routes the air to one set of tubing tuned to f or the second set of tubing tuned to b ."}
{"member collection": [], "message topic": []}